Island



R. H. RICE. UYLINDRICAL RQTARY VALVE.

(.N'o Model.)

Patented Nov, l?, 1896.

VElyl A UNITED STATES PATENT EEicE.

CYLIN DRICAL ROTARY VALVE.

SPECIFICATION forllng' part Of Letters Patent NO. 571,687, dated November 17, 1896. Application filed October 25, 1895. Serial No. 566,909. (No model.)

To v/Z whom it may concern:

Re it known that I, RICHAD ll. RICE, a citizen of the United States, residing at Providence, in the State of Rhode Island, have invented a new and useful Improvement in Cylindrical Rotary Valves and Valve-Seats for Steam-Engines, of which the following .is a specilication.

lily invention relates to the improved construction of a rotary valve and its valve-seat, whereby, after the valve and val ve-seat have become worn, their bearing-surfaces may be treed np without changing the distance between the opening edges of the valve or of the ports of the valveseat, thus obviating the necessity of constructing anew valve, as heretofore; and my invention consists in a roi'ary steam or exhaust valve having its opening faces arranged perpendicnlarly to a plane which coincides with the opening edges of the two opposite opening faces of the valve, and also in a cylindrical valve-seat provided with a plurality of ports, the walls of which at their opening edges are arranged perpendicnlarly to a plane which coincides with the opening edges of the two opposite ports of the valveseat, as hereinafter fully set forth.

In the accompanying drawings, Figure l represents a longitudinal section of a steamengine cylinder provided with steam and exhaust valves embodying my improvement. Fig. 2 represents an enlarged transverse section of the exhaust-valve. Fig. 3 represents an enlarged transverse section of the steamvalve. Fig. i shows a modification in the number of ports in the exhaust-valve seat.

In the drawings, A represents the longitudinal section of a steam-engine cylinder, B B the steam-valves, and O O the exhaust-valves. rlhe cylindrically-curved valve-seat a, (shown enlarged in Fig. 2,) is provided with the ports I1 lf; and in carrying ont my invention the walls c e, which form the opening faces of the ports l) li", are made to extend perpendicnlarly of the plane a: ai, which is coincident with the opening edges CZ d' of the ports l) l1', so that when the valve-chamber D is bored out to repair the worn valve-scat a the cutting away of the material to form a new seat will not cause a change in the distance between the opening edges :il d". Therefore, the saine e haust-if'alve O may be employed.

In Fig. i the exhaust-valve seat o is shown as having three ports Y) li' if? instead of the two ports Il' shown in Fig. 23 and in this case the wall e?, which forms the opening face of the middle port Ui, is also made to extend perpendicularlyto the planea; r, which is coincident with the opening edges d d of the opposite ports l) lr' which lie at each side of the inner port 112.

The opening faces e e' of the exhaust-valve O, as shown in Fig. 2, are made perpendicular to the plane .r u', which coincides with the opening edges ff of the valve, and the opening face e2 of the exhaust-valve C, (shown in Fig. 4,) is also made perpendicular to the plane a: .1, which coincides with the outer opening edges ff of the valve, the intermediate opening edge f'2 bei ng located below the said plane, and when. the cylindrical bearing-face g of the valve O is iurned off with the turning axis of the valve moved baci; in the plane y Ay, which is perpendicular to the plane a? ai', the saine distance between the opening edges ff of the valve will be preserved, so as to properly lit the openings of the ports in the valve-seat.

The application of my improvement to the steam-valve B and its seat a' is shown in the enlarged cross-section, Fig. 3. The opening faces 71 7i' of the said valve and the opening walls rL' 17 of the ports jj are made perpendienlar to the same plane a: when the opening edges of the valve and the ports are touching eachother, as shown in the drawings. The valve and its seat may therefore be trued np when required without changing the distance between the opening edges of the valve or of the ports, where by the same valve may be continued in use 'with its valve-seat, thns obviating the necessity of making a new valve.

I claim as my inventioni. A rotary'steain or exhaust valve, having a cylindrical bearingsurface, with its opening faces arranged pcrpendicnlarly to a plane, which coincides with the opening edges of the two opposite opening' faces of the valve, substantially as described.

2. A cylindrical val ve-seat, provided with IOO a plurality of ports, the Walls of which, at their opening edges, are arranged perpendiculnrly to a plane which coincides with the ropening edges of the two opposite ports of the Valve-seat, substantially as described.

3. The combination of a cylindrical valveseat,y having; a plurality of ports, with a ro-y tary steam or exhaust valve, the opening faces of the 'valve and of the ports of the Vabre-seat', being arranged perpendcularly to a plane, 1.o which coincides with the twofoppositefopening edges7 substantially as described.

RICHARD H. RICE. Titnessesz ,SOCRATES SCHOLFIELD, BROR J. LINDGREN. 

